CN2325858Y

CN2325858Y - High performance, low smoke and non-halogen flame retarded cable

Info

Publication number: CN2325858Y
Application number: CN 98201942
Authority: CN
Inventors: 周叙元; 陈慧娟; 朱宁
Original assignee: BAYI CABLE GROUP Co Ltd CHANGZHOU
Current assignee: BAYI CABLE GROUP Co Ltd CHANGZHOU
Priority date: 1998-03-12
Filing date: 1998-03-12
Publication date: 1999-06-23
Anticipated expiration: 2008-03-12

Abstract

The utility model relates to a high-performance, low-smoke and non-halogen flameproof cable. The utility model is composed of an insulated wire core, a protective sleeve, etc. The insulating layer of each single wire core in the cable of the utility model has a multilayer structure, namely, two or more than two layers. The insulating layer with a two-layer structure is composed of an inner layer and an outer layer; the inner layer is an insulating layer which is made of granular or zonal insulating material, and the outer layer is a fireproof layer which is made of low-smoke non-halogen flameproof material. The combined oxygen index of the inner layer and the outer layer is larger than or equal to 34 percent. The insulating layer with a multilayer structure is composed of an inner layer, middle layers and an outer layer. The utility model can be widely used in the industries, such as aeronautics, spaceflight, subway, tunnel and nuclear industry.

Description

A kind of high performance low smoke halogen-free flame-retardant cable

All single insulated wire cores that the utility model relates in a kind of cable, particularly cable must be passed through testing vertical flammability, can have the low-smoke halogen-free flame retardant cable of high electrical performance again.

Insulated wire cores in the cable, common structure and manufacturing process are with extruder insulating material to be extruded on the conductor wire core, reach the purpose of core insulation, and insulation layer structure is an individual layer.But this structure and technology are used existing commercially available material, can not satisfy industries such as space flight and aviation, skyscraper, subway, tunnel, nuclear industry with the following specification requirement of special cable to the single insulated wire cores of cable:

1 cable long-term work temperature: 90 ℃

2 insulation resistance constant K i: in the time of 20 ℃, 〉=3000M Ω km;

In the time of 60 ℃, 〉=30M Ω km;

In the time of 90 ℃, 〉=3M Ω km.

3 insulation mechanical performance: tensile strength 〉=9MPa, elongation at break 〉=120%.

4 insulating thermal aging performances: 120 ± 2 ℃, after 240h is aging, mechanical performance rate of change≤± 25%.

5 insulated wire cores flame-retarding characteristics: must pass through single testing vertical flammability, and reach the low smoke and zero halogen requirement, be i.e. burning gases solution ph 〉=4.3; Conductance≤10 μ S/mm.

The purpose of this utility model provides a kind of special purpose cable that improves insulation layer structure, and it can fully satisfy the specification requirement of special cable to the insulated wire cores strictness.

High performance low smoke halogen-free flame-retardant cable of the present utility model partly is made up of insulated wire cores and sheath etc., is characterized in that the insulating barrier of the single core in the cable is a sandwich construction, is two layers or more.The insulating barrier of two-layer structure, by internal layer and outer the composition, internal layer is that electric property reaches the not insulating barrier made of the insulating material of Halogen of special cable specification requirement, the outer flame-retardant layer of making for the material that is reached the special cable specification requirement by the low-smoke non-halogen flame-retardant performance.Combination oxygen index 〉=34% of skin and internal layer.

Special purpose cable of the present utility model has following advantage: (1) uses existing commercially available material to make, and needn't develop the new flame-retardant insulating material that can satisfy specific (special) requirements; (2) have insulation resistance constant height, the insulation good mechanical property, the flame-retarding characteristic advantages of higher can satisfy the specification requirement of the strictnesses that department proposed such as space flight and aviation, nuclear industry, subway; (3) manufacturing process is simple, and cost is low.Can utilize the production and the checkout equipment of existing general cables manufacturing factory, and be easy to produce in enormous quantities.

The utility model has following accompanying drawing:

The single core of Fig. 1 is by internal layer and the outer insulated wire cores cutaway view that extrudes formula insulation system special cable

The insulated wire cores cutaway view of the sandwich construction special cable that Fig. 2 internal layer is made up of wrapped formula and the outer formula of extruding

Fig. 3 is by the insulated wire cores cutaway view of internal layer, intermediate layer and the outer sandwich construction special cable of forming

Below in conjunction with drawings and Examples the utility model is described in further detail.

Embodiment 1 Fig. 1 is the insulated wire cores cutaway view of internal layer and outer layer insulation structure special cable, and among the figure, 1 is conductor wire core, and 2 is internal layer (insulating barrier), and 3 is outer (flame-retardant layer).

The graininess insulating material (crosslinked polyethylene, cross-linked polyolefin etc.) that will meet following technical conditions extrudes the formula insulating material as internal layer:

1 specific insulation: in the time of 20 ℃, 〉=1 * 10 ¹⁶Ω .cm;

2 mechanical performances: tensile strength 〉=9MPa, elongation at break 〉=200%.

3 heat aging properties: 135 ± 2 ℃, after 240h is aging, mechanical performance rate of change≤± 25%.

The 4 burning gases aqueous solution: PH 〉=4.3; Conductance≤10 μ S/mm,

The graininess insulating material that will meet following technical conditions extrudes formula insulating material (cross-linked polyolefin or polyolefin etc.) as skin:

1 oxygen index 〉=38%.

2 mechanical performances: tensile strength 〉=9MPa, elongation at break 〉=120%.

3 heat aging properties: 120 ± 2 ℃, after 240h is aging, mechanical performance rate of change≤± 25%.

The 4 burning gases aqueous solution: PH 〉=4.3; Conductance≤10 μ S/mm.

Inside and outside layer insulating material is by the gradation of extruder or once extrude, and is wrapped on the conductor wire core, makes insulated wire cores.If when adopting the warm water crosslinking insulating material as primary insulation, should note after inside and outside layer insulation all extruded, carrying out again crosslinked, determining of crosslinking time and temperature is basis with inside and outside layer insulation thickness.No matter adopt the insulating material of which kind of type, combination oxygen index 〉=34% of inside and outside two-layer insulation.

Embodiment 2 Fig. 2 are insulated wire cores cutaway views by the sandwich construction special cable of strip insulation material coiled for internal layer.Among the figure, 1 is the lead core, and 2 is internal layer (insulating barrier), and 3 is outer (flame-retardant layer), and as shown in FIG., internal layer is two-layer structure (two layers wrapped), also can be set as one or more layers.

The strip insulation material (polyester film etc.) that will meet following technical conditions is as the primary insulation material:

During 20 ℃ of 1 specific insulations, 〉=1 * 10 ¹⁶Ω cm.

2 mechanical performances: tensile strength 〉=150MPa, elongation at break 〉=60%.

3 temperature resistant grades 〉=120 ℃.

4 low cigarettes, Halogen.

Outer 3 insulating material are polyolefin (or cross-linked polyolefin etc.).The banded insulating material of internal layer is wrapped on the conductor wire core by wrapped machine, and the rate of putting up is not less than 25%, and by in addition thermal contraction of heating tube, 6～8 meters of heating tube length, heating-up temperature between 150～200 ℃, 20～25 meters/minute of take-up speeds.

Skin 3 insulating material (cross-linked polyolefin or polyolefin etc.) among the embodiment (1) are extruded by extruder is disposable, be extruded on the conductor wire core of existing lapped insulation, make insulated wire cores.The insulating material of internal layer 2 makes up oxygen index 〉=34% with the insulating material of skin 3.

Adopt multilayer insulation core structure and technology thereof, solved insulating material can not have required electrical property of cable and low-smoke non-halogen flame-retardant performance simultaneously under present technical conditions a difficult problem.The banded insulated with material layer of the internal layer of the inner insulation layer of embodiment (1) and embodiment (2) has the desired electrical property of cable, the outer insulation of the outer layer insulation of embodiment (1) and embodiment (2) then has the desired low-smoke non-halogen flame-retardant performance of cable, the insulated wire cores that both combine and form can effectively realize the high-performance that a kind of insulating material can not have simultaneously.

The utility model is because of all utilizing now production, the checkout equipment of general cables manufacturing factory, and designed structure is simpler, institute so that manufactory realize easily.From producing target in enormous quantities, embodiment (2) " the low-smoke halogen-free flame retardant cable of wrapped formula multilayer insulation core structure ", be better than embodiment (1) and " extrude the low-smoke halogen-free flame retardant cable of formula multilayer insulation core structure ", its rate of finished products is higher, and can ripe production overlength degree cable.

Embodiment 3 Fig. 3 are the insulated wire cores cutaway view of sandwich construction special cable, and 1 is conductor wire core among the figure, and 2 is internal layer, and 4 is the intermediate layer, and 5 is outer.Internal layer 2 is to be wrapped on the core 1 by wrapped machine by the strip insulation material that electrical property reaches the special cable specification requirement, and material therefor is a polyester film etc.Intermediate layer 4 is to reach the insulating material that the special cable specification requirement takes into account electrical property and fire resistance simultaneously by radiation-resistant property to make, outer 5 is to reach the flame-retardant layer that the material of special cable specification requirement is made by the low-smoke non-halogen flame-retardant performance, and material therefor is polyolefin, cross-linked polyolefin etc.

Claims

1. high performance low smoke halogen-free flame-retardant cable, partly form by insulated wire cores and sheath etc., the insulating barrier that it is characterized in that the single core in the cable is a sandwich construction, be two layers or more, the insulating barrier of inside and outside structure, form by internal layer (2) and outer (3), internal layer (2) reaches the not insulating barrier made of the insulating material of Halogen of special cable specification requirement, the flame-retardant layer that make for the material that is reached the special cable specification requirement by the low-smoke non-halogen flame-retardant performance outer (3) for electric property.

2. cable as claimed in claim 1, it is characterized in that the high electrical performance internal layer (2) of inside and outside layer insulated wire cores and high flame resistance skin (3) are extruded by the graininess insulating material of Halogen not forms, the internal layer material therefor is a cross-linked polyolefin etc., outer material therefor is a low smoke halogen-free flame-retardant polyolefin etc., can gradation or once extrude combination oxygen index 〉=34% of combined material.

3. cable as claimed in claim 1, the high electrical performance internal layer (2) that it is characterized in that inside and outside layer insulated wire cores is made up of on conductor wire core by wrapped machine is wrapped the strip material of Halogen not; Outer (3) are extruded by the low-smoke non-halogen flame-retardant granular material and form combination oxygen index 〉=34% of combined material.

4. cable as claimed in claim 1 is characterized in that the high electrical performance internal layer (2) of insulated wire cores, and anti-radiation performance insulating material intermediate layer (4) is formed by the material of Halogen not; Outer (5) are extruded by halogen-free low-smoke flame retardant material and form combination oxygen index 〉=34% of combined material.